Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

doi:10.1088/1674-1056/25/1/015204

中国物理B ›› 2016, Vol. 25 ›› Issue (1): 15204-015204.doi: 10.1088/1674-1056/25/1/015204

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

M N Stankov, A P Jovanović, V Lj Marković, S N Stamenković

Department of Physics, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, Niš 18001, Serbia

收稿日期:2015-05-20 修回日期:2015-09-10 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: M N Stankov E-mail:marjansstankov@gmail.com
基金资助:
Project supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. ON171025).

Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

M N Stankov, A P Jovanović, V Lj Marković, S N Stamenković

Department of Physics, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, Niš 18001, Serbia

Received:2015-05-20 Revised:2015-09-10 Online:2016-01-05 Published:2016-01-05
Contact: M N Stankov E-mail:marjansstankov@gmail.com
Supported by:
Project supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. ON171025).

摘要/Abstract

摘要： The dominant process in relaxation of DC glow discharge between two plane parallel electrodes in argon at pressure 200 Pa is analyzed by measuring the breakdown time delay and by analytical and numerical models. By using the approximate analytical model it is found that the relaxation in a range from 20 to 60 ms in afterglow is dominated by Ar₂⁺ ions, produced by atomic-to-molecular conversion of Ar⁺ ions in the first several milliseconds after the cessation of the discharge. This conversion is confirmed by the presence of double-Gaussian distribution for the formative time delay, as well as conversion maxima in a set of memory curves measured in different conditions. Finally, the numerical one-dimensional (1D) model for determining the number densities of dominant particles in stationary DC glow discharge and two-dimensional (2D) model for the relaxation are used to confirm the previous assumptions and to determine the corresponding collision and transport coefficients of dominant species and processes.

关键词: argon discharge, afterglow relaxation, fluid model, plasma reactions

Abstract: The dominant process in relaxation of DC glow discharge between two plane parallel electrodes in argon at pressure 200 Pa is analyzed by measuring the breakdown time delay and by analytical and numerical models. By using the approximate analytical model it is found that the relaxation in a range from 20 to 60 ms in afterglow is dominated by Ar₂⁺ ions, produced by atomic-to-molecular conversion of Ar⁺ ions in the first several milliseconds after the cessation of the discharge. This conversion is confirmed by the presence of double-Gaussian distribution for the formative time delay, as well as conversion maxima in a set of memory curves measured in different conditions. Finally, the numerical one-dimensional (1D) model for determining the number densities of dominant particles in stationary DC glow discharge and two-dimensional (2D) model for the relaxation are used to confirm the previous assumptions and to determine the corresponding collision and transport coefficients of dominant species and processes.

Key words: argon discharge, afterglow relaxation, fluid model, plasma reactions

中图分类号: (Electric discharges)

52.80.-s

52.20.-j (Elementary processes in plasmas) 52.65.Kj (Magnetohydrodynamic and fluid equation) 82.33.Xj (Plasma reactions (including flowing afterglow and electric discharges))

M N Stankov, A P Jovanović, V Lj Marković, S N Stamenković. Conversion of an atomic to a molecular argon ion and low pressure argon relaxation[J]. 中国物理B, 2016, 25(1): 15204-015204.

M N Stankov, A P Jovanović, V Lj Marković, S N Stamenković. Conversion of an atomic to a molecular argon ion and low pressure argon relaxation[J]. Chin. Phys. B, 2016, 25(1): 15204-015204.

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Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

Conversion of an atomic to a molecular argon ion and low pressure argon relaxation

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